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UDN2983 high side counterpart of ULN2803


On Mon, 16 Jun 2008, Tom=C3=A1s =C3=93 h=C3=89ilidhe wrote:

>=20
> I need a transistor to use as a switch. One side of the switch will go=20
> to Vcc, the other will go to the anode of an LED which then goes to a=20
> resistor and then to ground. I'll need 12 of these on my board (I've got=
=20
> twelve 12 different LED's).
>=20
> Normally I use the ULN2003 driver chip for this purpose, but I can't=20
> find a PNP version of it (i.e. a version that will provide a path to Vcc=
=20
> rather than to ground).
>=20
> The current through the switch won't be more than 30 mA.
>=20
> I could use a simple bi-polar junction transistor such as a BC327 but=20
> then I'd need a resistor for the base. And because I've got 12 of these=
=20
> LED's, that would mean 12 more resistors on my board, so I'd rather go=20
> for an option that doesn't require a resistor.
>=20
> So I'm thinking along the lines of a NMOS transistor. The gate will be=20
> connected to an output pin on a PIC chip. The source will go to Vcc and=
=20
> the drain will go to an LED's anode.
>=20
> Can anyone suggest a very simple NMOS transistor that's on at 5 V and=20
> off at 0 V, and that can pass 30 mA? Or if you've got another idea,=20
> please throw it out there :-D
>=20
> --=20
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>=20
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